# The perimeter of the rectangle is 22 cm, and one of its sides is 7 cm, find the second side of the rectangle.

August 29, 2021 | education

| It is known that the perimeter of a rectangle is 22 cm, and one of its sides is 7 cm. Let’s define the second side of the rectangle.

The perimeter is the sum of the lengths of all sides of the rectangle. Hence, we get the following solution.

P = (a + b) × 2.

22 = (a + 7) × 2.

a + 7 = 22 ÷ 2.

a + 7 = 11.

a = 11 – 7 = 4.

This means that the second side of the rectangular is 4 cm.

Answer: the second side of the rectangle is 4 cm.

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